Coated base fabric for airbag and method for manufacturing same

Abstract

Provided is a coated fabric for airbags that exhibits a small variation in air permeability of the fabric in the width direction, and a method for producing a coated fabric for airbags capable of reducing the variation in air permeability. The coated fabric for airbags includes a woven fabric composed of synthetic fiber filaments and has an elastomer resin applied to one surface thereof, the coated fabric having an air permeability in the width direction of the coated fabric such that the maximum value of the air permeability is 1.5 times the average value or less.

The invention claimed is: 
     
       1. A coated fabric for airbags,
 the coated fabric comprising a woven fabric composed of synthetic fiber filaments and having an elastomer resin applied to at least one surface of the woven fabric, 
 the coated fabric having an air permeability in the width direction of the coated fabric such that the maximum value of the air permeability is 1.5 times the average value or less. 
 
     
     
       2. The coated fabric for airbags according to  claim 1 , having a bow and skew of 1.5% or less. 
     
     
       3. The coated fabric for airbags according to  claim 1 , wherein the elastomer resin is a solvent-free addition polymerization silicone. 
     
     
       4. The coated fabric for airbags according to  claim 1 , wherein the amount of the applied elastomer resin is 1 to 30 g/m 2 . 
     
     
       5. The coated fabric for airbags according to  claim 1 , wherein the total fineness of the filaments constituting the woven fabric is 200 to 600 dtex. 
     
     
       6. The coated fabric for airbags according to  claim 1 , wherein the cover factor of the woven fabric is 1,800 to 2,500. 
     
     
       7. A method for producing the coated fabric for airbags of  claim 1 , comprising:
 a base fabric feeding step comprising applying a fabric tension (Tp) to the woven fabric; and 
 a resin coating step comprising applying the resin to at least one surface of the woven fabric by a knife-on-air method after the base fabric feeding step, 
 wherein the correlation between the fabric tension (Tp) and a fabric tension (Ta) in the resin coating step is 0≤Ta−Tp≤300 N/m. 
 
     
     
       8. The method for producing the coated fabric for airbags according to  claim 7 ,
 wherein the fabric tension (Ta) in the resin coating step is 250 to 650 N/m. 
 
     
     
       9. The method for producing the coated fabric for airbags according to  claim 7 ,
 wherein a temperature of 60 to 120° C. is applied to the fabric in the base fabric step.